Automotive digging, gathering, carrying, and leveling scraper



Jan. 13, 1942. F. D. wlLsoN Erm. 2,269,502

CARRYING, AND LEVELING SCRAPER AUTOMOTIVE DIGGING, GATHERING,

Filed May 1l, 1938 6 Sheets-Sheet l N. QN

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F. D. WILSON ETAL 2,269,502

AUTOMOTIVE DIGGING, GATHERING, CARRYING, AND LEVELING SCRAPER Jan. 13,` 1942.

Filed May l1, 1938 6 Sheets-Sheet 2 Jan. 13, 1942. F D, WILSON ET-AL I 2,269,502

AUTOMOTIVE DIGGING, GATHERING, CARRYING, AND LEVELING SCRAPER Filed May 11, 1938 e sheets-sheet s 'V 0h35 Q lla Q N Jan. 13, 1942. F. D. WILSON ET AL AUTOMOTIVE DIGGING, GATHERING, CARRYING, AND LEVELING SCRAPER Filed May l1, 1938 6 Sheets-Sheet 5 @Mix/fm@ 5y U/,a @MM Jan. 13, 1942. F. D. wlLsoN ETAL AUTOMOTIVE DIGGING, GATHERING, CARRYING, AND LEVELING SCRAPER Filed May 11, 1958 6 Sheets-Sheet 6 /N VEN roRs A Patented Jan. 13, 1942 AUTOMOTIVE DIGGING,

GATHERING,

CARRYING, AND LEVELING SCRAPER Fred D. Wilson and Leonard S. Burns, Aurora, Ill., assignors to Western-Austin Company, Aurora, Ill., a corporation of Illinois Application May l1, 1938, Serial No. 207,360

' (o1. .av- 124) 13 Claims.

The present invention relates to digging, gathering, carrying and leveling scrapers, but particularly to that class of self-propelled moving and hauling machines which digs, gathers, carries and discharges dirt for road and other construction purposes and is operated by one man. 'I'he machine of the present invention differs very materially from other machines, as at present designed and used, in that the material digging. gathering, carrying and discharging means, or the scraper bowl, is located at an end of the unit and the unit itself is not only self-propelled but is designed to be steered and to travel in either direction, having equal traveling speeds in either direction.

The idea underlying this invention involves utilizing to the maximum the tractor or prime mover employed and it is for this reason that we employ an unusual number of traveling speeds in either direction. For instance, it is quite obvious that the digging and gathering operation requires a relatively low traveling speed because of the resistance to the propelling wheels at such a time, but after the digging and gathering operation has been completed and the carrying operation started, the tractor or prime mover in our machine is easily capable of moving the machine at a much greater speed than herebefore and we are able (by having several higher speeds) to choose the highest speed under which the tractor or prime mover can operate, ground condi-v tions considered. It will therefore be seen that, with an arrangement as herein described, we are able to reduce to a minimum the time required in traveling from the digging and gathering point to the discharging point, thus operating the tractor onprime mover ,at its maximum eiliciency at all times.

Dirt moving methods of today generally involve two separate units, the tractor or prime than a combination built along the lines outlined in our present invention. Also, the excess weight of the other combination units not only serves to increase the first cost but also the depreciation and operating expense, to say nothing about the loss of efficiency and time due to the turning which is necessary at both the digging and gathering point and the discharging point.

mits the discharging of material over the edge of an embankment, which is always necessary when widening roads or filling around new bridges and culverts, or building the type of construction conventionally known as over-passes.

One of the objects of this invention is to provide a self-propelled scraper having the scraper viously is the principal cause of present day tractors being so heavy. Also, in a dual combination of this kind, the weight of the material after it is gathered in the scraper bowl is in no way used to increase the tractive weight, and therefore the traction, of the tractor, as it is in our invention. Obviously, this means that the total weight of the two units must, of necessity, be far greater 55 mounted at one end of the frame with means for raising and lowering the scraper bowl to control the depth of the cut made by the scraper and also to control the height of the material being emptied from said scraper bowl, thus spreading an even depth of material at any desired place.

Another object of this invention is to provide an automotive .machine adapted for traveling in either direction and equipped with manual or power controlled steering means on one end and a scraper bowl with means to control the depth of the cut on the other end.

Another object of this invention is to provide an automotive machine adapted to be driven and steered in either direction, having a scraper bowl with a controlled apron for holding material locatedv at an end of the machine, and means at the operators station to steer either end separately or both ends together and to raise, lower and control the apron and unload the scraper bowl.

Another object of this invention is to provide an automotive machine equipped with ground contacting propelling means ahead of the power means, and ground contacting steering means in the rear of the power means.

Another object of this inventionis to provide an automotive machine for moving material,

equipped with an independent manual or power controlled clutch and brake for the purpose of retarding or stopping either of the said propelling units and to assist a third ground-contacting unit in steering.

Another object of this invention is to provide an automotive machine adapted to travel in either direction and equipped with the same number of speeds for traveling in either direction, the scraper bowl being so located relative to the supporting means that it is easily possible to discharge its contents beyond the edge of an embankment.

Another object of this invention is to provide an automotive machine that can be used for leveling, as all supporting wheels traveling on the planed surface will permit settingthe cutting edge of the scraper bowl to smooth the high spots, thus depositing this excess material in the scraper bowl until it is required to be discharged for filling the low spots.

Another object of this invention is to provide a material digging, gathering, carrying and discharging scraper comprising a main frame, power driven wheels mounted at one end with a power plant and power raising and lowering device, and an auxiliary frame supported by a steering wheel with a scraper bowl and apron on the other end in front of the power driven wheels and main frame, one end of the main frame being pivotally connected to the auxiliary frame in front of the steering wheel and the other end having a power raising and lowering means supporting the auxiliary frame and scraper bowl.

Another object of this invention is to provide an automotive machine wherein the independently controlled power driven units receive their power from one power plant and the s power driven units can be controlled independently or together.

Further objects of this invention are to provide a construction of maximum simplicity, efficiency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

The invention further resides in the combination, construction and arrangement of parts illustrated in the accompanying drawings and, while we have shown therein a preferred embodiment, it is to be understood that the same is susceptible of modification and change without departing from the spirit of the invention.

In the drawings:

Figure 1 is a plan view of the automotive scraper.

Figure 2 is a side elevation showing the cable and bell crank connected to a single hydraulic cylinder Vfor raising and lowering the scraper bowl and the 'auxiliary frame.

Figure 3 is a front portion of the side elevation showing hydraulic means connected direct to the main and auxiliary frames for raising and lowering the scraper bowl and auxiliary frame. 4

Figure 4 shows the side elevation and the dumping position of the scraper bowl.

Figure 5 is a side elevation showing the digging position of the scraper bowl.

Figure 6 is a front portion of a plan view showing the method of employing two cylinders for moving the back of the scraper bowl to unload the scraper bowl.

Figure 7 is a side elevation of Figure 6.

Figure 8 is a sectional view at 8-8 of Figure 6.

Figure 9 is the digging position of Figures 6 and 7.

Figure l0 is a sectional view of Figure 2 at 10-10.

Figure l1 is a rear elevation of Figure 2.

Figure l12 is a front elevation of Figure 2.

Figure 13 shows the train of gears at I 3-I3 of Figure l5.

Figure 14 shows the train of gears at Il--Il 0f Figure 15.

Figure 15 is a cross section of the main axle and wheels, auxiliary transmissions, clutches and brakes, and the main shaft which is connected to the power plant.

Figure 16 shows the train of gears and a por-. tion of axle housing at line Iii-I6 of Figure 15.

Figure 1'7 is a portion of the side elevation of Figure 15 showing a part of the clutch control.

Figure 18 is a schematic drawing showing the hydraulic control of the steering, clutching and declutching and braking, raising and lowering of the scraper bowl, opening and closing of the apron and the moving of the back of the scraper bowl for dumping.

Referring to the drawings, the automotive scraper comprises a main frame I and subframe la, having front driving wheels 2 and 3 attached to the main frame I by stationary axle 4. The main frame I and the sub-frame Ia, at the opposite end from the wheels 2 and 3, are supported by shaft Ii, which is attached to the auxiliary frame 5. The sub-frame Ia is attached to shaft B by bearings 1 and 8. The main frame I and the sub-frame Ia oscillate in relation to auxiliary frame 5 about pin III, which is attached to plate II and reinforcement I2, which in turn is attached to auxiliary frame 5, and the outer ends of shaft 6 are guided in this oscillating movement by the guide members 32, which are attached to the yauxiliary frame 5. The forward end of sub-frame Ia is attached to the axle housing 3| of wheels 2 and 3 by vertical connections 68. Intermediate of the axle housing 3l and shaft 6, cross members 33 connect sub-frame Ia to main frame I,

The auxiliary frame 5 in supported at the end opposite the driving wheels 2 and 3 of the main frame I by rotatable steering wheel I8. At the forward end of auxiliary frame 5, the side plates I6 and Il of scraper bowl I3 are attached to the two side members Il and I5 of the auxiliary frame 3 by welding, riveting, bolting or any other method which may be preferred. Opposite the scraper bowl I3 is the rotatable steering wheel I3, mounted on a rotatable circle frame I8 to which are attached depending arms 20, which form supports for the axle 2| of the said rotatable steering wheel I8. vThe rotatable steering wheel I8 is mounted on axle 2| by roller bearings or any other form of bearing. The rotatable steering wheel I8 and the rotatable circle frame I9 rotate in the guides 22, while are attached to the auxiliary frame 5, by means of hydraulic cylinders 23 and 24. Hydraulic cylinders 23 and 24 are attached to the auxiliary frame 5 by pinconnections 25 and 26 and the piston rods 21 and 28 are fastened to the rotatable circle frame I9 by pins 29 and 30.

The scraper bowl I3 has a movable back 34, swingable about shaft 35, which is connected to the two side plates I6 andv I1 of the scraper bowl I3. A hydraulic cylinder 36 is mounted on thebottom 9| of the scraper bowl I3 by means of vertical members 31 and by pin 38. The piston 39 is attached to the movable back 34 by pin 40. By admitting pressure on the top side of hydraulic cylinder 36, the piston 39 will be extended and will automatically move the movable back 34 forward to dump or to push out the load in the scraper bowl I 3.

Figures 6, '7, 8 and 9 illustrate another method of moving the movable back 34 of the scraper bowl I3; that is, by the use of two hydraulic cylinders 83 and 84, which are attached to the bottom 9| of the scraper bowl I3 by pins 85 and 86. The piston rods 81 and 88 are attached to the movable back 34 by pins 89 and 90. In addition to the side plates I6 and I1 of the scraper bowl I3, there are vertical members 92 and 93, the lower ends of which are welded to the bottom 9| of the scraper bowl I3 and the upper ends of which are welded to a horizontal cross member 94, which is in turn attached to the side members I4 and I5 of the auxiliary frame 5 by gussets 95 and 96. This construction is used to stiii'en the-center of bottom 9| of the scraper bowl I3 and also to take'the pull exerted by the hydraulic cylinders 83 and 84 in moving the movable back 34 during the dumping of the load.

The construction shown in Figures l, 2, 4 and illustrates a single cylinder 36 which pushes the movable back 34, while the construction shown in Figures 6, 7, 8 and 9 illustrates the use of two hydraulic cylinders 83 and 84 which pull the movable back 34 in dumping the load. The operation is similar in both methods.

The apron 43, which prevents material from spilling out of the scraper bowl I3, is mounted to the side plates I6 and I1 of the scraper bowl I3 by pins 44 to permit' the opening and closing of the apron 43. The opening and closing of the apron 43 is accomplished by hydraulic cylinders 4.5 and 46, which are attached to the side members I4 and I5 of auxiliary frame 5 by pins 41. The pistons 48 and 49 are attached to the apron 43 by pins 50 and 5I. Directly in back of stationary axle 4 on the side members of the main frame I are mounted bell cranks 52 and 53 by means of pins 54 and the lower ends of vertical links 55 are attached to the bell cranks 52 and 53 by pins 51 while the upper ends of links'55 are attached to the side members I4 and I5 of the auxiliary frame 5 by pins 56.

Mounted on the main frame I is hydraulic cylinder 58 (Figs. l, 2, 4, 7, 9 and 18), which is attached to the main frame I by pin 59 with cables 60 and 6I attached to the cross head 62 of i the piston 63. The cables 60 and 6I are in turn the cables 60 and 6| are threaded thru sheavel wheels 65, 66 and 81. By admitting oil in hydraulic cylinder 58, we can automatically raise or lower the scraper bowl I3 and the auxiliary frame 5 and control the depth ofthe cut as well asthe position of the scraper bowl I3 when transporting material. This is a floating mechanism.

Another method of raising and lowering the scraper bowl I3 and the auxiliary frame I is shown inFigure 3 and consists of ball and socket joints 69 attached to the side members ci the main frame I, having mounted thereon hydraulic cylinders 10 and 10a with piston rods 1| and 1|a connected to the side members I4 and I5 of the auxiliary frame 5 by pins 12. By admitting oil, or any other fluid pressure means, into the cylinders 10 and 10a, the raising and lowering of the scraper bowl I3 and the auxiliary frame 5 is accomplished. This is a more rigid mechanism.

Referring to Figure 15, wheels 2 and 3 have a taper fit and a key 91 mounted on the oating axles 98 and 99, which in turn are mounted on the stationary axle 4 by means ofroller bearings 9. On the inner ends of each of the oating axles 98 and 99 are mounted* four shafts |00, |0I, |02 and |03 and I00a, IOIa, |02a and I03a with roller bearings |18 on which'the planetary gears |04, |05, |06 and |01 and I04a, |05a, |06a and I01a are mounted. (See Figure 16 for arrangement.) three parts. The center4 part |08 also forms a support vfor the stationary axle 4. At each end of the center part |08 of axle housing 3| are in'- ternal gears |09 and I|0 which mesh with gears |04, |05, |06 and |01 and I04a, I05a, |06a and |0'Ia. At the outside of the internal gears |09 and I|0 are dust protectors III and II2. The dust protectors III and II2 and internal gears |09 and ||0 are bolted to the center part |08 of axle housing 3| by bolts ||3 and |l4, thus forming an integral housing.

Power plant 13 is mounted on the sub-frame Ia, said power plant 13 having the usual transmission 14 for changing the speed with the clutch 18 having an extension for operation by foot pedal on the operators station |32, and gear shift lever 15 mounted thereon. Mounted on the power plant 13, preferably at the front end, is a hydraulic pump 16 which is driven by the fan shaft 11 for the purpose of supplying pressure to the various hydraulic cylinders.`

Main shaft 19 of the power plant 13 is extended to universal joints 80, to which is attached a main drive shaft 8| of auxiliary transmissions 4| and 42. Auxiliary transmission 4I is for the purpose of driving and controlling wheel 2 and auxiliary transmission 42 is for the purpose of driving and controlling wheel 3. The auxiliary transmissions 4I and 42 have auxiliary clutches II 5 and IIB with brakes ||1 and H8.

Main drive shaft 8| is supported in the axle housing 3| by ball bearings ||9 and |20. Intermediate the train of gears |2I shown on Figure 14 and the train of gears |22 shown on Figfure 13 (corresponding to lines |3-I3 and |4-I'4 on Figure 15), is a shifting gear 82 which can be shifted either to the right or to the left, depending on the direction of travel desired. You will note that by shifting the shifting gear 82 to the right, the train of gears |2I shown in Figure 14 will drive the wheels 2 and 3 forward, vthat is in the direction to load the scraper, and by shifting the shifting gear 82 to the left, the train of gears v The axle housing 3| is made offrom the loading point. Gears |2|a and |22a are mounted on spline shaft |23 and gears |2|c and |22c are mounted on spline shaft |24.` Auxiliary clutch ||6 and brake ||3 are also mounted on spline shaft |23 and auxiliary clutch |I5 and brake ||1 are mounted on spline shaft |24. Spline shaft |24 is mounted in the axle housing 3| on roller bearings |25 and spline shaft |23 is mounted in the axle housing 3| on roller bearings |26. Spline shaft |24 has beveled pinion |21 mounted thereon, which drives beveled gear |28, which is mounted on stationary axle 4 on roller bearings |29. At the side nearest the wheel 2 is a gear |30 which revolves on brass bearing |3| which is mounted on stationary axle 4. The gear |30 in turn drives the train of gears |04, |05, |00 and |01 which are mounted on shafts |00, |0|, |02 and |03 and cause the floating axle 98 upon which the wheel 2 is mounted to revolve.

The arrangement of gears, floating axles, etc., is duplicated for the purpose of driving wheel 3. Thus it is seen that the operator on the operators station can declutch either clutch ||5 or ||6 and brake either brake l1 or ||8, as desired. When the shifting gear 82 is in mesh with the train of gears |2| shown in Figure 14, the ma'- chine will be going forward and, should the operator desire to make a quick turn to the left, he will steer the rotatable steering wheel IB and also declutch the clutch IIB and apply the brake IIB, which will cause wheel 3 to remain stationary and thus allow wheel 2 to revolve about wheel 3. It can be readily seen that by using this combination, the machine can turn in a very narrow space.

The main steering means is the rotatable steering wheel l which is rotated in the direction desired by hydraulic cylinders 23 and 24 (see Figs. 1, 2, 4, and 18) and controlled from the operators station 32 by means of steering lever |33, which operates the steering control valve |34 by means of connecting rod |35. The steering control valve |34 is slidably mounted on a plate |36 which is attached to the sub-frame la. The opposite end of the steering control valve |34 is attached to one end of lever I 31 by connecting rod |38. Lever |31 is attached to the side member |5 of auxiliary frame 5 by fulcrum |43 and the opposite end of lever |31 is connected to the circle plate |39 of circle frame |9 by connecting rod |40 at |44.

Assuming that we wish to rotate the rotatable steering wheel 8 and circle frame I9 with its circle plate |39 in the direction of the arrow |4|,

the operator turns the steering lever |33 clockwise and the fluid will flow thru the pipe line |42 to the under side of hydraulic cylinder 24, ex-

erting a pulling action on piston rod 28, while the fluid will be applied to the upper part of hydraulic cylinder 23, which will exert a pushing action on piston rod 21. Thus the power of both hydraulic cylinder 23 and 24 is exerted to rotate the rotatable steering wheel I3 and circle frame I3 with its circle plate |39 in the direction of arrow |4|. By rotating the rotatable steering wheel I8 and circle frame I3 with its circle plate |33 in the direction of arrow |4|, the connecting rod |40, which is attached to the circle plate |35 at |44, will exert a pushing action on the'lever |31 and a pulling action on the connecting rod |36, which is attached to the lever |31 and steering control valve |34, causing the steering 'control valve |34 to slide toward hydraulic cylinder 24. This action will close the steering control valve |34 and stop the rotation of the rotatable steering wheel I3 unless the operator continues to turn steering lever |33 and moves connecting rod |35 in the same direction; that is. follows the steering control valve |34 as it moves.

'I'he operator at the operators station |32 has full control of the movement, or steering, of the rotatable steering wheel I3, which is caused by its rotation on the circle irame I9. If it is desired to rotate the rotatable steering wheel I3 in the direction of arrow |45, the steering lever |33 is turned in a counterclockwise direction and the fluid will flow thru the pipe line |42A to the upper side of hydraulic cylinder 24 and the under side of hydraulic cylinder 23. Thus. it is readily seen that the control of the rotatable steering wheel i3 is dependent on the direction of the movement of the steering lever |33 and by the operation of steering lever |33 and the use of either control lever |41 or |43, the scraper can be turned in a very short radius and can be moved quickly in and out of narrow spaces. and it also can be operated either forward or backward at the same speed and the brakes can be applied to each wheel individually or to both wheels together at one time. The turning can be accomplished in either direction by the control levers |33, |41 and |48. The driving wheels 2 and 3 can also be used to assist in making a shorter turn than is possible by using only the rotatable steering wheel I0.

The combination as described and illustrated increases the ability of the scraper to maneuver in places where it would be impossible to operate a tractor-drawn scraper. This is strictly a oneman scraper, where the operator has full view of the loading as well as the dumping of the scraper without turning about, as it is necessary to do when operating a tractor-drawn scraper.

The control valve |46, located at the operators station |32 with control levers |41 and |43, is manipulated by independent foot levers which are not shown. Operating the foot pedal attached to control lever |41 will allow the fluid to iiow thru the tube |49 to the cylinder |50 which is connected to the sub-frame |a by pin |5| and will cause a pull to be exerted on piston rod |52 which is connected to dual bell crank |53 by pin |54, dual bell crank |53 being mounted on the axle housing 3| by bracket |55 and pin |56 (see Figs. l5, 17 and 18). One arm |80 of dual bell crank |53 is connected to connecting rod |51, the other end of connecting rod |51 being attached to lever |56 which is mounted on the top of axle housing 3| by pin |53. The opposite end of lever |58 engages the declutching lever |60 and at the same time, by means of another arm |13 of dual bell crank |53, connecting rod |6| is attached to the brake operating lever |62 which controls the brake ||1 on spline shaft |24 and applies the brake.

By this operation the wheel 2 is prevented from revolving while the wheel 3 will revolve and assist the rotatable steering wheel i8 in making a very short turn.

The same operation can be performed on the opposite side by means of cylinder 50a. Oper ating the foot pedal attached to control lever |44 will allow the fluid to flow thru the tube |46a to the cylinder 50a which is connected to the sub-frame la by pin |5|a and will cause a pull to be exerted on piston rod |52a which is connected to dual bell crank |53a by pin |5411, dual bell crank |53a being mounted on the axle housing 3| by bracket |56aand pin I 53a. One arm me of dual ben crank Issa is connected to connecting rod |51a, the other end o f connecting rod I51a being attached to lever |58a which is,

mounted on the top of axle housing 3I`by pin I59a. The opposite end of lever I58a engages the declutching lever I6iia and ab the same time, by means of another arm I19a of dual bell crank I53a, connecting rod I6 I a is attached to the brake operating lever |62a which controls the brake II 8 on spline shaft |23 and applies the brake.

Mounted at the operators station is a multiple control valve |63 with control levers |64, |65 and |66. The hydraulic -pump 16 supplies the luid under pressure thru the steering control valve |34 out thru the tubing |61 into the multiple valve |63, and the fluid will by-pass thru'the multiple valve |63 thru tubing |68, which supplies the fluid under pressure to control valve |46. There is a by-pass in the tubing |68 which permits the excess iluid to now thru check valve |69 and back thru tubing |10 to the tank |1I which is mounted on sub-frame Ia. Constant pressure is maintained in multiple valve |63, which permits the operation of either the control leverA |64, |65, |66 when desired. Control lever |66 controls the raising and lowering of the scraper bowl i3 and the auxiliary frame 5, as before explained, by means of hydraulic cylinder 58, allowing the fluid to flow thru tube |12 or |13 as desired. Control lever |65 controls the movement of the opening and closing of the apron 43 by admitting iluid under pressure thru the tubes |14 and |15 to the hydraulic cylinders 45 and 46, depending on the direction of movement desired; that is, opening or closing. The

control lever |64 controls the movement of the movable back 34 by admitting fluid underVV pressure to hydraulic cylinder 36 thru tubes |16 and |11, depending upon whether its movement is outward or inward. This same lever can be used in controlling the two cylinders 83 and 84 by the proper connections of the tubing |16 and |11. Thus, all the control levers are located at the operators station for the control of the raising and lowering of the scraper bowl I3 and the auxiliary frame 5, the opening and closing of the apron 43 and the movement of the movable back 34 of the scraper bowl I3. l

By the use of cables 60 and 6|, which are attached to the cylinder 58 which controls the raising and lowering of the scraper bowl I3 and the auxiliary frame 5, the scraper bowl I3 can float or tilt, so to speak, in case it hits an obstruction on one side of the scraper bowl I3 during the movement of the machine either in a forward or a backward direction.

Thus, it is readily seen that by the use of the controls provided, the scraper can be used to accomplish more work during a given length of time than a scraper which has to be attached to a tractor.

`We claim:

l. In a self-propelled scraper, in combination, a main and auxiliary frame, a .scraper bowl mounted at one end of the auxiliary frame and a rotatable steering Wheel mounted on and supporting the opposite end, power means and a sub-frame mounted on the main frame, independently controlled power driven wheels with clutching, declutching and braking means at the back of the scraper bowl supporting one end of the main frame and the opposite end of said main frame connected to the auxiliary frame for oscillating movement, means mounted on the mainframe and connected to the auxiliary frame mounted on the front end and a rotatable steering wheel with steering means mounted on and supporting the rear end, said main frame supported at the front end in back of the scraper bowl by independently power driven wheels with control means and at the rear end attached to the said auxiliary frame, power means and an operators station mounted on said main frame, raising and lowering means mounted on the said main frame and attached to the said auxiliary frame, independent control means at the operators station to independently control the power driven wheels, steer the rotatable steering wheel and control all the movements of the scraper.

3. In a self-propelled scraper, in combination, a main frame and an auxiliary frame, a scraper bowl with movable back and apron mounted on one end of said auxiliary frame with a steeraple `power driven wheels and controlall the movements of the scraper.

4. In a self-propelled scraper, in combination,

a main frame and an auxiliary frame, a scraper bowl with movable back and apron mounted on one end of said auxiliary frame and a steerable wheel supporting the opposite end, independent power driven wheels supporting said main frame in back of said scraper bowl and the opposite endv supported by said auxiliary frame, independent control means for each power driven wheel and the steerable wheel, means for raising, lowering and moving vthe' movable back and apron of said scraper bowl mounted on said auxiliary frame, an operators station and power means on said main frame, control means on the operators station to control all movements of the scraper and the steerable wheel and the forward and backward movement of the independent power driven wheels to carry the load in the scraper bowl-as fast in one direction as in the opposite direction.-

5. In a machine of the class described, in combination, a main frame and an auxiliary frame, said main frame supported by independently controlled power driven wheels at one end and at the opposite end by said auxiliary frame, raising and lowering means mounted between said main frame and said auxiliary frame supporting one end of said auxiliary frame and steering means supporting the opposite end, a material digging and carrying device carried by the said auxiliary lyv controlled power driven wheels when digging and to discharge materialk over an embankment when dumping, an operators station and power means having transmission mechanism arranged for a plurality of equal speeds in both directions, making turning unnecessary, means mounted at the operators station to control the movements of the said power driven wheels and the movements of the material digging and carrying device and the auxiliary frame.

6. In a self-propelled machine of the class described, in combination, a main frame and an auxiliary frame supported by independently power driven wheels and a rotatable steering wheel, said auxiliary frame having at one end a scraper bowl with a movable back and apron mounted thereon projecting forwardly of the said power driven wheels and supported by said main frame and the said rotatable steering wheel mounted on and supporting the opposite end, said independently power driven wheels with control mechanism supporting one end of said main frame and the opposite end pivotally attached to said auxiliary frame in front of said rotatable steering wheel, means mounted on the said main frame to raise and lower the scraper bowl and said auxiliary frame, an operator's station and power means on said main frame, control means at the operators station for independently steering the said rotatable steering wheel and controlling the rotation, clutching, declutching and braking of the said independently power driven wheels, and the raising and lowering of the scraper bowl and said auxiliary frame.

7. In a self-propelled scraper, in combination, a main frame and an auxiliary frame, independently controlled power driven wheels supporting one end of the main frame and the opposite end connected to the auxiliary frame, a power plant having two auxiliary transmissions independently connected to said power driven wheels with independent controls mounted on said main frame, a scraper bowl attached to one end of the auxiliary frame and extending beyond the power driven wheels and a rotatable steering wheel mounted on and supporting the opposite end, raising and lowering means mounted between the main frame and the auxiliary frame, an operators station on said main frame, independent control means at the operators station to control the raising and lowering of the scraper bowl and auxiliary frame and to steer the rotatable steering wheel, and also independently or simultaneously control each of the auxiliary transmissions.

8. In a self-propelled scraper, in combination, a main irame and an auxiliary frame, said main frame being supported at one end by independently controlled power driven wheels and the opposite end connected by oscillating means to the said auxiliary frame, said auxiliary frame having a scraper bowl with movable apron and movable back and control means mounted on one end in front of the independently controlled power driven wheels and supported by raising and lowering means mounted on the main frame and a steerable wheel mounted on and supporting the opposite end, a power plant with control means and an operators station mounted on the said main frame, steering mechanism mounted on the auxiliary frame and attached to the steerable wheel, control means at the operators station to independently control the steering of the steerable wheel and the rotation, clutching, declutching and braking of the independently controlled power driven wheels, the raising and lowering of the scraper bowl and the auxiliary frame and the movements of the movable back and apron o! the scraper bowl.

9. In a self-propelled scraper, in combination, a main frame and an auxiliary frame, said main frame being supported at one end by independently controlled power driven wheels and the opposite end connected by oscillating means to the said auxiliary frame, said auxiliary frame having a scraper bowl with movable apron and movable back and hydraulic control means mounted on one end in front of the independently controlled power driven wheels and supported by hydraulic power raising and lowering means mounted on the main frame and a steerable wheel mounted on and supporting the opposite end, a power plant with control means and an operators station mounted on the said main frame, hydraulic steering mechanism on the auxiliary frame and attached to the steerable wheel, hydraulic control means at the operators station to independently control the steering of the steerable wheel and the rotation, clutching, declutching and braking of the independently controlled power driven wheels, the raising and lowering of the scraper bowl and the auxiliary frame and the movements of the movable apron and back of the scraper bowl.

l0. In a self-propelled scraper, in combination. a main frame and an auxiliary frame, said main frame being supported at one end by independently controlled power driven wheels and the opposite end connected by oscillating means to thesaid auxiliary frame, said auxiliary frame having a scraper bowl with movable apron and movable back and hydraulic control means mounted on one end in front of the independently controlled power driven wheels and supported by power raising and lowering means mounted on the main frame and a steerable wheel mounted on and supporting the opposite end, a power plant with hydraulic clutching, declutching and braking means and an operators stof tion mounted on the main frame, hydraulic control means at the operators station to independently control the steering of the steerable wheel and the rotation, clutching, declutching and braking of they independently controlled power driven wheels, the raising and lowering of the scraper bowl and auxiliary frame and the movements of the movable apron and back of the scraper bowl.

11. In a self-propelled scraper, in combination, a main frame and an auxiliary frame, said main frame being supported at one end by independently controlled power driven wheels and the opposite end connected by oscillating means to the said auxiliary frame, said auxiliary frame having a scraper bowl with movable apron and movable back andcontrol means mounted on one end in front of the independently controlled power driven wheels and supported by links and bell cranks mounted on the main frame and a steerable wheel mounted on and supporting the opposite end, means mounted on said main frame and connected to said bell cranks to raise and lower the said auxiliary frame and the scraper bowl, a power plant with control means and an operators station mounted on the said main trame, steering mechanism mounted on the auxiliary frame and attached to the steerable wheel control means at the operators station to in: dependently control the steering of the steerable wheel and the rotation, clutching, declutching and braking of the independently controlled power driven wheels, the raising and lowering of the auxiliary frame and the scraper bowl and the movements of the movable apron and back the opposite end connected by oscillating means to the said auxiliary frame, said auxiliary frame having a scraper bowl with movable apron and movable back and hydraulic controll means mounted on one end in front of the independently controlled power driven wheels and supported by links and bell cranks mounted on the main frame and a steerable wheel mounted on and supporting the opposite end, hydraulic means mounted on said main frame with a exible connection to said bell cranks to raise and lower the said auxiliary frame and the scraper bowl, a power plant With control means and an operators station mounted on the said main frame, hydraulic steering ymechanism on the auxiliary frame and attachedto the steerable wheel, hydraulic control means at the operators station to independently or simultaneously control the steering of the steerable wheel and the rotation, clutching, declutching and braking of the independently controlled power driven wheels, the raising and lowering of the auxiliary trame and the scraper bowl and the movements of the movable apron and back of the scraper bowl.

13. In a self-propelled scraper, in combination,

'a main frame, an auxiliary frame and a subframe, said main frame being supported at one end by a non-rotatable axle with axle housing and independently controlled power driven wheels mounted thereon and the opposite end connected by oscillating means to the said auxiliary frame, said auxiliary frame having a scraper bowl with movable apron Aand movable back and control means mounted on one end in front of the independently controlled power driven wheels and supported by raising and lowering means mounted on the main frame and,a steerable wheel mounted on and supporting the opposite end, said sub-frame being supported by the said axle housing and the said main frame and having mounted thereon an operators station and a power plant with one main transmission and two auxiliary transmissions with braking means, steering mechanism mounted on the auxiliary frame and attached to the steerable wheel, control means at the operators station to independently control the steering of the steerable wheel and the rotation, clutching, declutching and braking of the independently controlled power driven wheels, the raising and lowering of the auxiliary frame and the scraper bowl and the movements of the movable apron and back oi' the scraper bowl.

FRED D. WILSON. LEONARD S. BURNS. 

